All-solid-state flexible supercapacitor based on nanotube-reinforced polypyrrole hollowed structures

Hyungho Kwon, Dong Jin Han, Byung Yang Lee

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


Supercapacitors are strong future candidates for energy storage devices owing to their high power density, fast charge-discharge rate, and long cycle stability. Here, a flexible supercapacitor with a large specific capacitance of 443 F g-1 at a scan rate of 2 mV s-1 is demonstrated using nanotube-reinforced polypyrrole nanowires with hollowed cavities grown vertically on a nanotube/graphene based film. Using these electrodes, we obtain improved capacitance, rate capability, and cycle stability for over 3000 cycles. The assembled all-solid-state supercapacitor exhibits excellent mechanical flexibility, with the capacity to endure a 180° bending angle along with a maximum specific and volumetric energy density of 7 W h kg-1 (8.2 mW h cm-3) at a power density of 75 W kg-1 (0.087 W cm-3), and it showed an energy density of 4.13 W h kg-1 (4.82 mW h cm-3) even at a high power density of 3.8 kW kg-1 (4.4 W cm-3). Also, it demonstrates a high cycling stability of 94.3% after 10 000 charge/discharge cycles at a current density of 10 A g-1. Finally, a foldable all-solid-state supercapacitor is demonstrated, which confirms the applicability of the reported supercapacitor for use in energy storage devices for future portable, foldable, or wearable electronics.

Original languageEnglish
Pages (from-to)41495-41502
Number of pages8
JournalRSC Advances
Issue number68
Publication statusPublished - 2020 Nov 13

Bibliographical note

Funding Information:
This project was supported by the National Research Foundation (NRF) funded by the Korea Ministry of Science and ICT (2018R1A2B2006640, 2016M3A7B4909581) and Global Frontier Project from the Center for Integrated Smart Sensors (CISS-2011-0031866).

Publisher Copyright:
© 2020 The Royal Society of Chemistry.

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering


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